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Learning over the holidays: Yet Another Bug Tracker sample app
If you are reading this blog, I assume that you are a like-minded person. My idea of relaxation is to sit and write code. Hopefully on something that I’m not familiar with. I have many such blog post...
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RavenDB HTTP Compression: Bandwidth & Time reductions
I recently talked about how RavenDB is now using ZStd as the default compression algorithm for backups. That led to a reduction both in the amount of storage we are consuming for backups and a...
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RavenDB, Raspberry Pi & Hugin Appliance: oh my!
RavenDB can run on the Raspberry Pi, it is actually an important use case for us when our users are deploying RavenDB as part of Internet of Things systems. We wanted to showcase RavenDB’s performance...
View ArticleRecording: Technology & Friends - Oren Eini on the Corax Search Engine
When Oren Eini originally developed RavenDB, he used the Lucene library to implement indexing. Eventually, his team encountered limitations with this strategy, so they created the Corax search engine,...
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RavenDB and Two Factor Authentication
RavenDB is typically accessed directly by your application, using an X509 certificate for authentication. The same applies when you are connecting to RavenDB as a user. Many organizations require that...
View ArticleRavenDB’s storage engine: Voron–unlocking the secret
A couple of months ago I had the joy of giving an internal lecture to our developer group about Voron, RavenDB’s dedicated storage engine. In the lecture, I’m going over the design and implementation...
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Vacations, leaky abstractions, and modeling concerns, oh my!
Our task today is to request (and obtain approval for) a vacation. But before we can make that request, we need to handle the challenge of building the vacation requesting system. Along the way, I...
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Corax Query Plan visualization
Corax is the new indexing and querying engine in RavenDB, which recently came out with RavenDB 6.0. Our focus when building Corax was on one thing, performance. I did a full talk explaining how it...
View ArticleReading unfamiliar codebases quickly: LMDB
Reading code is a Skill (with a capital letter, yes) that is really important for developers. You cannot be a good developer without it.Today I want to talk about one aspect of this. The ability to go...
View ArticleIndexing only recent data - adventures with large datasets & archiving
We recently got a support request from a user in which they had the following issue:We have an index that is using way too much disk space. We don’t need to search the entire dataset, just the most...
View ArticleCaching documents in RavenDB: The good, the bad and the ugly
RavenDB has a hidden feature, enabled by default and not something that you usually need to be aware of. It has built-in support for caching. Consider the following code:async...
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Isn't it ironic: Money isn't transactional
I write a transactional database for a living, and the best example of why we want transactions is transferring money between accounts. It is ironic, therefore, that there is no such thing as...
View ArticlePerformance discovery: Managed vs. Unmanaged memory
When building RavenDB, we occasionally have to deal with some ridiculous numbers in both size and scale. In one of our tests, we ran into an interesting problem. Here are the performance numbers of...
View ArticlePerformance discovery: IOPS vs. IOPS
RavenDB is a transactional database, we care deeply about ACID. The D in ACID stands for durability, which means that to acknowledge a transaction, we must write it to a persistent medium. Writing to...
View ArticlePartial writes, IO_Uring and safety
In my previous post, I discussed how Linux will silently truncate a big write (> 2 GB) for you. That is expected by the interface of write(). The problem is that this behavior also applies when you...
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RavenDB 7.1: Next-Gen Pagers
Even though RavenDB 7.0 isn’t quite out of the gate yet (expect the release very soon), I want to start talking about the RavenDB 7.1 release. This release is going to represent the biggest change in...
View ArticleRavenDB 7.1: Write modes
In the previous post, I talked about a massive amount of effort (2+ months of work) and about 25,000 lines of code changes. The only purpose of this task was to remove two locks from the system. During...
View ArticleRavenDB 7.1: Reclaiming disk space
After describing in detail the major refactoring we did for how RavenDB (via Voron, its storage engine) has gone through, there is one question remaining. What’s the point? The code is a lot simpler,...
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RavenDB 7.1: Shared Journals
I wrote before about a surprising benchmark that we ran to discover the limitations of modern I/O systems. Modern disks such as NVMe have impressive capacity and amazing performance for everyday usage....
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On the role of design documents
When we build a new feature in RavenDB, we either have at least some idea about what we want to build or we are doing something that is pure speculation. In either case, we will usually spend only a...
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